[Letux-kernel] [PATCH v3 0/7] iio: adc: palmas_gpadc: add iio events

Jonathan Cameron jic23 at kernel.org
Fri Apr 7 19:04:35 CEST 2023

On Wed,  5 Apr 2023 23:22:26 +0200
Patrik Dahlström <risca at dalakolonin.se> wrote:

> This series is based on linux-next/master [1] and [2].
> The palmas gpadc block has support for monitoring up to 2 ADC channels
> and issue an interrupt if they reach past a set threshold. This can be
> configured statically with device tree today, but it only gets enabled
> when reaching sleep mode. Also, it doesn't look like anyone is using it.
> Instead of this one special case, change the code so userspace can
> configure the ADC channels to their own needs through the iio events
> subsystem. The high and low threshold values can be set for every
> channel, but only 2 thresholds can be enabled at a time. Trying to
> enable more than 2 thresholds will result in an error.
> The configured thresholds will wake up the system from sleep mode if
> wakeup is enabled in /sys/devices/.../power/wakeup.
> The old platform data was removed.
> Thresholds, events, and wakeup were tested on omap5-uevm board. It wakes
> up from sleep mode when wakeup is enabled and a threshold is passed. A
> userspace tool for monitoring events and adjusting thresholds can be
> found at [3].
> V2 -> V3:
> * Rebased to linux-next.

As per reply to the earlier thread.  Don't base on linux-next.
It can be very unstable though not so much later in a cycle like this.

If there isn't a lot of churn going on in the driver, fine to base on
previous release kernel or rc1 (good to say if it is an rc1)

If there is churn underway (which is true here) then iio/togreg + extra
patches lists that need to be applied listed in this cover letter.

I'm also fine with you just adding the devm patch to this series as
the first patch.


> * Avoid reconfiguring events on error and when old == new value.
> V1 -> V2:
> * Begin by removing adc_wakeupX_data instead of doing it last.
> * Split changes in smaller patches
> [1] git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
> [2] https://lore.kernel.org/linux-iio/20230318163039.56115-1-jic23@kernel.org/
> [3] https://github.com/Risca/pyra_vol_mon
> Patrik Dahlström (7):
>   iio: adc: palmas: remove adc_wakeupX_data
>   iio: adc: palmas: replace "wakeup" with "event"
>   iio: adc: palmas: use iio_event_direction for threshold polarity
>   iio: adc: palmas: move eventX_enable into palmas_adc_event
>   iio: adc: palmas: always reset events on unload
>   iio: adc: palmas: add support for iio threshold events
>   iio: adc: palmas: don't alter event config on suspend/resume
>  drivers/iio/adc/palmas_gpadc.c | 559 +++++++++++++++++++++++++++------
>  include/linux/mfd/palmas.h     |   8 -
>  2 files changed, 464 insertions(+), 103 deletions(-)
> base-commit: 8417c8f5007bf4567ccffda850a3157c7d905f67
> prerequisite-patch-id: b0418c707db13f514400956596e9ebe91c25bba0

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